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(a) Schematic illustration of the fabrication of tannic acid/polyvinyl alcohol (TA/PVA) fiber by electrospinning. (b) scanning electron microscope (SEM) images of TA/PVA fiber with low and high magnifications. Scale bars: 50 μm (left) and 10 μm (right). (c) Stress–strain curves of PVA fiber and TA/PVA fiber. (d) Water contact angles of PVA fiber and TA/PVA fiber.
